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Unfortunately this seaplane base doesn't show up on the aeronautical charts at http://skyvector.com/?ll=25.761061845308774,-79.23504639034341&chart=301&zoom=1 and according to Wikipedia the airline that used to service this base, Chalk's International Airline, lost its flying charter in 2007 so it's possible that it's closed.
I was trying to determine which hotel to choose based on it's proximity to the seaplane base. It appears that the marker for the base is in the midst of trees with no access roads. I expected the location to be near civilization at a marina.